/*!
    \file    main.c
    \brief   TIMER1 output delayable single pulse demo for GD32H7xx
    
    \version 2025-01-24, V1.4.0, firmware for GD32H7xx
*/

/*
    Copyright (c) 2025, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#include "gd32h7xx.h"
#include <stdio.h>
#include "gd32h759i_eval.h"

/* configure the TIMER peripheral */
void timer_config(void);
/* configure the GPIO ports */
void gpio_config(void);
/* enable the CPU cache */
void cache_enable(void);

/*!
    \brief      enable the CPU cache
    \param[in]  none
    \param[out] none
    \retval     none
*/
void cache_enable(void)
{
    /* enable i-cache */
    SCB_EnableICache();
    /* enable d-cache */
    SCB_EnableDCache();
}

/*!
    \brief      configure the GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
*/
void gpio_config(void)
{
    rcu_periph_clock_enable(RCU_GPIOA);

    /*configure PA5(TIMER1 CH0) as alternate function*/
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_5);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_60MHZ, GPIO_PIN_5);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_5);

    /*configure PA1(TIMER1 CH1) as alternate function*/
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_1);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_60MHZ, GPIO_PIN_1);
    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_1);
}

/*!
    \brief      configure the TIMER peripheral
    \param[in]  none
    \param[out] none
    \retval     none
*/
void timer_config(void)
{
    /* -----------------------------------------------------------------------
    TIMER1 configuration: delayable single pulse mode
    - the external signal is connected to TIMER1 CH0 pin(PA5), and the rising
      edge reset and start counter.
    - TIMER1 frequency is set to 300MHz, the prescaler is 30000, so TIMER1
      counter frequency is 10KHz.
    - the delayable single pulse waveform is output on TIMER1 CH1 pin(PA1).
    - the delayable single pulse width is determined by the TIMERx_CAR register,
      and the high level width is 10000/10KHz = 1s.
    ----------------------------------------------------------------------- */
    timer_oc_parameter_struct timer_ocinitpara;
    timer_parameter_struct timer_initpara;
    timer_ic_parameter_struct timer_icinitpara;

    rcu_periph_clock_enable(RCU_TIMER1);
    rcu_periph_clock_enable(RCU_SYSCFG);
    timer_deinit(TIMER1);

    /* TIMER1 configuration */
    timer_struct_para_init(&timer_initpara);
    timer_initpara.prescaler         = 29999;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 9999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;
    timer_init(TIMER1, &timer_initpara);
    
    /* TIMER1 CH0 input capture configuration */
    timer_channel_input_struct_para_init(&timer_icinitpara);
    timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_RISING;
    timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
    timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
    timer_icinitpara.icfilter    = 0x00;
    timer_input_capture_config(TIMER1, TIMER_CH_0, &timer_icinitpara);
    timer_input_trigger_source_select(TIMER1, TIMER_SMCFG_TRGSEL_CI0FE0);

    /* TIMER1 CH1 output configuration */
    timer_channel_output_struct_para_init(&timer_ocinitpara);
    timer_ocinitpara.outputstate  = TIMER_CCX_ENABLE;
    timer_ocinitpara.outputnstate = TIMER_CCXN_DISABLE;
    timer_ocinitpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;
    timer_ocinitpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
    timer_ocinitpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
    timer_ocinitpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;
    timer_channel_output_config(TIMER1, TIMER_CH_1, &timer_ocinitpara);

    /* config TIMER1_CH1 output as delayable single pulse mode */
    timer_delayable_single_pulse_mode_config(TIMER1, TIMER_CH_1, TIMER_OC_MODE_DSPM1, TIMER_COUNTER_UP);
}

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    cache_enable();
    /* configure the GPIO ports */
    gpio_config();
    /* configure the TIMER peripheral */
    timer_config();

    while(1);
}
